(E)-2,3-Bis(4-methoxy­phen­yl)acrylic acid

In the title mol­ecule, C17H16O4, the angle between the aromatic ring planes is 69.1 (6)°. The crystal structure is stabilized by inter­molecular O—H⋯O hydrogen bonds; mol­ecules related by a centre of symmetry are linked to form inversion dimers.